Carrier 17EX Start-up, Operation And Maintenance Instructions Manual

Also see for 17EX Series: Start up & operation manual Start-up, operation and maintenance instructions

Contents

4. General Recommendationsa. Both disc couplings are designed to operate for ex-tended periods without the need for lubrication or main-tenance. Visual inspection of the disc packs is enoughto assess the operational condition of the coupling.b. All machinery should be monitored to detect unusualor changing vibration levels. Both couplings, under nor-mal operating conditions, have no wearing parts andretain their original balance quality. Any change in vi-bration levels should be investigated, and remedial ac-tion should be taken immediately.5. Removala. Disassemble the coupling in the reverse order of theapplicable assembly procedure.b. Keyed couplings — Install a puller on the hub usingthe tapped holes provided in the hub face. Pull the huboff the shaft.IMPORTANT INFORMATION:Coupling guards protect personnel. ALL COUPLINGSMUST BE COVERED WITH A GUARD ACCORD-ING TO OSHA (Occupational Safety and HealthAdministration) REQUIREMENTS. Safety guards areincluded with this product and must be installed at alltimes.1. Recheck alignment after all foundation bolts and me-chanical connections are tightened.2. Make sure all fasteners are properly installed andtightened.3. Take the time to double check your work.4. Only authorized disc coupling manufacturer replacementparts are to be used.5. Call the disc coupling manufacturer for any clarificationsor questions.The self-locking nuts on the disc pack bolts shouldbe replaced after they have been assembled and re-moved from the bolts 5 times.Check Oil Pressure and Compressor Stop1. When the motor is up to full speed, note the differentialcompressor oil pressure reading on the LID default screen.It should be between 18 and 30 psid (124 to 206 kPad).2. Press the Stop button and listen for any unusual soundsfrom the compressor as it coasts to a stop.Calibrate Motor Current Demand Setting1. Make sure that the MOTOR RATED LOAD AMPS pa-rameter on the SERVICE1 screen has been configured.Place an ammeter on the line that passes through the mo-tor load current transfer on the motor side of the powerfactor correction capacitors (if provided).2. Start the compressor and establish a steady motor currentvalue between 70% and 100% RLA by manually over-riding the guide vane target value (TARGET GUIDE VANEPOS parameter on the STATUS01 screen) and setting thechilled water set point (WATER/BRINE SETPOINT on theSTATUS01 screen) to a low value. Do not exceed 105%of the nameplate RLA (rated load amps).3. When a steady motor current value in the desired rangeis reached, compare the MOTOR RATED LOAD AMPSvalue on the STATUS01 screen to the actual amps shownon the ammeter on the starter. Adjust the amps value onthe STATUS01 screen to match the actual value on thestarter ammeter, if there is a difference. Highlight the ampsvalue; then, press the SELECT softkey. Press theINCREASE or DECREASE softkey to bring the valueto that indicated on the ammeter. Press ENTER whenthe values are equal.4. Release the target guide vane position to automatic mode.See the section on Manual Operation of the Guide Vanes,page 58, for instructions on how to do this.To Prevent Accidental Start-Up — The PIC can beconfigured so that starting the unit is more difficult than justpressing the LOCAL or CCN softkeys during chiller serv-ice or whenever necessary. Access the STATUS01screen, and highlight the CHILLER START/STOP param-eter. Override the value by pressing SELECT and then theSTOP and ENTER softkeys. The word SUPVSR ap-pears. When attempting to restart the chiller, remember torelease the override. Access the STATUS01 screen and high-light CHILLER START/STOP. The 3 softkeys represent 3choices:• START - forces the chiller ON.• STOP - forces the chiller OFF• RELEASE - puts the chiller under remote or schedulecontrol.To return the chiller to normal control, press theRELEASE softkey; then, press the ENTER softkey. Foradditional information, see Local Start-Up, page 43.The default LID screen message indicates which com-mand is in effect.Hot Alignment Check — The operating temperaturesof various chiller components can affect the alignment of thecompressor with the heat exchangers, gear, and driver. Whenall the chiller components have reached operating tempera-ture (after running at nearly full load for 4 to 8 hours), makea hot alignment check.Using proper equipment and procedures, make the hot align-ment check with either assembled or disassembled cou-plings. The procedures are detailed in the General Mainte-nance section, page 67.A clamping tool, Part No. TS-170, is available for check-ing alignment without disassembling the couplings. Checkwith your local Carrier representative.Never operate the compressor or drive with the cou-pling guards removed. Serious injury can result fromcontact with rotating equipment.Doweling — The size, quantity, and location of dowelsvary considerably with type and arrangement of gear anddrive. Check your job data for specific doweling instruc-tions. Typical doweling practices are described in the Gen-eral Maintenance section.Check Chiller Operating Condition — Check tobe sure that chiller temperatures, pressures, water flows, andoil and refrigerant levels indicate that the system is func-tioning properly.61